Electrically controlled strip serving machine



Oct. '1, 1946. c. E. BECKMAN ETAL 5 Sheets-Sheet 1 ELECTRICALLY CONTROLLED STRIP SERVING MACHINE Filed May 9 1942.

INVENTORS 47/622155 i'fierzfin/v BY 572:. 5. 2000s ATTORNEYS Oct. 1, 1946. -c. E. BECKMAN ET AL 0 ELECTRICALLY CONTROLLED STRIP SERVIN G MACHINE Filed May 9, 1942 5 Sheets-Sheet 2 5 h 27 L 4 Z INVENTORS 61/421651 5342.014

the: a .flaoas ATTORNEYS Oct. 1, 1946. c, E, BECKMAN EIAL 2,408,363

ELECTRICALLY CONTROLLED STRIP SERVING MACHINE Filed 9, 1942 5 Sheets-$het 3 INVENTORSv 42 a. @09 5 BY ATTORNEYS O 9 c. BECKMAN ET'AL 2,408,353

ELECTRICALLY CONTROLLED STRIP. SERVING MACHINE Filed- May 9, 1942 5 Sheets-Sheet 4 ATTORN EY5 Oct. 1, 1946. c. E BECKMAN ETAL' 2,408,363 ELECTRICALLY CONTROLLED STR IP SERVING MACHINE Filed May 9, 1942 s Sheets-Sheet 5 1 49 /46 wpuraa A Y a f0 5 ac/10mg 77 2 Y ATTORNEYS Patented Oct. 1 1946 ELECTRICALLY CONTROLLED STRIP SERVING MACHINE Charles E. Beckman and Earl B. Dodds, Chicago, Ill., assignors to Better Packages, Inc., Shelton, Conn, a corporation of New York Application May 9, 1942, Serial No. 442,386

32 Claims. 1 v

This invention relates to strip serving devices and, more particularly relates to motor driven strip serving devices in which accurate lengths of tape are measured and delivered, the measuring being controlled by electrical means.

Th invention contemplates the utilization of an electrical timing circuit for measuring pur poses whereby the timing interval coincides with the period of time during which feedin elements deliver tape so that a given interval of time will result in the feed of a given amount of tape. In particular, the use of an electric time measurin circuit is preferred in which the internal condition of th electric circuit when closed progrese sively changes so as to determine the duration of the tape feeding operation in accordance with the condition of the circuit and not by reason of the physical movements of the tape or of mechanical parts associated with the feed thereof. Strip serving devices have been proposed which are said to be adapted to serve various lengths of gummed moistened strip as the occasion may demand. Many of such machines depend upon the estimate of the operator of the amount of tape necessary, which estimate even when the operator is experienced, commonly results in a wasting of a substantialamount of tap since, a guess of alength, tooshort for use means waste of the entire piece delivered and alength which is longer than necessary may mean that as much as one third. or one half more than the amount of; tape necessary is deliveredwith each delivery cycle. of the machine.

Machines have also been proposed equipped with visual orjother measuring devices, but, these machines possess the disadvantage that in the case of visual 'measuring, the operator cannot operate at maximum speed and still measure properly and in the case of other measuring deP vices, the mechanisms themselves, for reasons of momentum feed from machine inertia'or other causes, are inaccurate and result'in waste'oftape. Furthermore, such machines if operated by hand or foot power deliver the tape at different speeds depending upon the vigor with which the tape delivery devices are actuated. This results in variable moistening of the tape, too much moisture being applied if the feed is too slow and too little if too fast.

Machines have also been proposed for deliveroperated by contact with the tape itself. These machines, however, present mechanical complications and when dependent upon an actuation by the tape, are subject to difliculties due to the unstable quality of the tape, its likelihood of buckling, curling and sticking, and other objections.

The present invention contemplates the obviation of all of thes difllculties by application, to

a simple construction of tape delivering machine including power driving means, of the principles of an electrical timing circuit whose internal condition can be varied irrespective of the amount of tape fed to efiect a control by predetermined intervals of time, said principles being modified, improved and adapted to the specific problem of delivery, of accurate lengths of gummed uniformly moistened tape ready for, use in a shipping room.

More specifically the invention contemplates the utilization of a pair of relatively movable feeding elements which can be alternately caused to grasp and release the tape in and from tape feeding relation and further contemplates the utilization of an automatically operated shear means which will sever the tape after each tape feeding enggagement of the tape feeding elements. 7 v

In the preferred construction of our invention it is contemplated that the feeding elements or at least one of them shall be constantly moved in tape; feeding direction but not necessarily in tape feeding relation during the entire time that the machine is in operation and it is further contemplated that at least one of these tape feeding elements shall be'motor driven. As stated above, the moving of the elements into tape feeding relation and the length of time which these elements remains in such relation, which length of time dictates the length of the tape to be delivered, are proposed to be controlled by an electrical timing circuit. We further propose to use any convenient means to control the new of current in the timing circuit which in turn will control the movement of the tape feeding elements into and out of tape feeding relation and the operation of the shear or cutter to sever the delivered strip. In a preferred form of our invention we use a series of specific resistances through which current will flow toya condenser, there being a resistance or set of resistances for each tape length which can be delivered. The tim taken to charge the condenser to a'fixed voltage is determined by the value of the resistanceinterposed in the'circuit.

herein, we have shown a pair of seriesof switches which may conveniently be operated 'by push buttons, the operation of which will clos the circuit and start the feed, as well as start the building up of the condenser at a rate determined by the resistances which have been interposed, the depression of a button of a series closing the neces sary circuits and inserting a resistance corresponding to a length of tape designated on the button.

Further objects and advantages will appear from the following description of preferred embodiments of the invention and the drawings. accompanying said description in which drawings,

Figure 1 is a longitudinal vertical sectional view through the tape delivering portion of a machine embodying our invention;

Figure 2 is a plan view of the machine with the top cover removed from the tape delivering portion of the machine and portions or the top of the control section of the machine being broken away;

Figure 3 is a transverse section taken at the position indicated by the lines 3-3 of Figures 1 and 2; V

Figure 4 i .a perspective View of a portion of the tape guiding means of the tap delivering portion of the machine;

Figure 5 is a detail view in longitudinal vertical section of the key construction taken on line 5-5 of Figure 2, electrical 'instrumentalitie's 'being omitted;

Figure 6 is a horizontal sectional "view taken on the line ii-6 of Figure 5; I

Figure? is a transversesection on line 1 1 of Figure .1 showin a preferred form of cutter;

Figure 8 is a wiring cfiag'ram of the control mechanism employed to feed and measure the tape, and

Figure 9 is a longitudinal vertical sectional view of a modified form of a'tape delivering and severing means.

Referring to the drawings in detail, a 'tape serving machine 'is shown including "means to withdraw tape from a roll and deliver it at the delivery end of'the machine inmoisten'ed, 'meastired, and severed strips ready for application to apackag'e to be sealed, ah'da control unit which controls the length of the strip of tape delivered atone actuation. V .{Ihe tape feeding and control units }'Ihay be mounted in a single or in separate housings and arranged in anyconvenient relative location. In the preferred construction illustrated, particularly in Figures 2 and3, .the two units 9 and to may preferably be mounted upona base .ll having feet 12 which rest on the surface on which the machine is placed. The tape serving unit and the control unit may be secured to the base ll by any convenient means such as screws '13 which hold brackets it which are attached to side walls I-l and 1B of the tap delivering unit and i9 and 26 of the control unit. Outside cbvers ZLmay be provided to cover the outer sides of the units and may be secured to the side walls'll' and iiilby the screws 22 secured to spacers 23 so that the entire machine will present a pleasing appearance and be free fromopenings for the entrane fd It is one of the features of this invention that these two units may be separated from each other conveniently for purposes of cleaning, repair or replacement of parts and to this end it is seen that by removing the screws l3 and by detaching the connecting plug 25, to be described, either unit may be removed from its position on the base for any desired reason. This is a particularly valuable feature with respect to the control unit as if there is any breakdown in such unit, it may be removed and a similar unit put in its place so that little time in operating the machin need be lost. As the two units are .mechanically independent, the operative connection between the two consisting entirely of the connecting plug 25 and electrical conductors, it will be seen that the control unit may be mounted in any suitable location either adjacent to or removed from the tape feeding unit, it being only necessary that the electrical conductors extend from one to the other. This permits the mounting of the tape feeding and control units each in the most convenient manner for handling of the tape and actuation of the control member's respectively.

The motor 2'! for driving the tape feeding means, which will more fully be described below, is preferably mounted to rest on the base II 'in the approximate center of the machine, as illustrated in Figure 1, and when the machine is in operating condition and the control unit in the position shown in Figure 3, the motor will lie partially in the zone of the control unit and partially in the zone of the tape serving unit, the walls 18 and 1'9 being cut away to provide for this mounting. Inasmuch as the motor is the heaviest part of the machine, it will be seen that this central mounting will be a great convenience should it be necessary to move the machine from one place to another in a shipping room as the weight of the machine will be more or less balanced and will thus render the machine easy to carry. Furthermore the motor is entirely concealed and allows the complete machine to assume a'pleasing and symmetrical appearance. A further advantage of mounting the motor in this pos'itionappears from Figure 1 as it is seen that 'th'etape roll 28 'may be mounted at the rear end of the machine behind the motor in that portion of "the machine which has the greatest height whereby the maximum diameter roll may be used obviating the necessity of frequent reloading of the machine. Furthermore, the tape maybe brought into proper position for its travel through the delivery means mor easily when the tape roll is mounted in this manner. The motor occupies space which might otherwise be wasted between the tape roll and the feeding and cutting devices at the forward end of the machine. Thus the motor is in juxtaposition to the tape feeding devices so that it may be arranged to drive theisa'me through'si'mple'gearing and the tape roll is'i'n proper relation to the tape delivery means.

Tape serving mech'anism.Th'e tape serving mechanism includes generally holding and guiding means for the roll of tape, tape web guiding means, feeding, severing and moistening means which will be describedin that order, that is in the order of the passage of tape through the machine. w i v Tape and web guiding.The tape roll '28 may be preferably placed ,in the machine through the top-thereof, the top coverv 24 whichisihinged at 26 to side plate I! being :opened and-preferably resting on the fountain H4. 'The' roll'2'8rests upon the plate 33 and against the brake roll'34 which together exert a: braking action thereon andprevent the roll from becoming excessively unwound during feeding. Access may be had to the 'roll through the back of the machine by opening cover 29, hinged at 30. Cover 29 is normally heldclosed by spring 32. The roll is further held in position by the side guide plates'35 pivoted at 3'! having guide ears 38 which key with'slots 39 in the plate 33. The plates 35 also have web guides which will be more fully described' below. The slots 39 mayprefrably be arranged at distances from eachv other equivalent to the various common commercial widths of tape so'that when the roll is placed in the machine and provisionally centered by hand, the plates 35 may be moved laterally on their pivotal mounting 31 until the ears38 fall into the proper slots 39. Thus the roll is exactlycentered in its proper position so thatthe tape web will be. delivered therefrom centered for, further delivery through the machine. .:;.The web guiding roller 3l mounted on the arms which are pivoted at 4| is normally in the full line position shown in Figure 1 during the operation-of the machine-but when it is desired toin'sert a roll of tapeinthe machine, the top cover.24 being opened, the arms 40 may be swung into the forward position shown in dotted lines in Figure 1 so that the roller 3| will be out of the way of the tape roll during insertion into the machine.v With cover 24 open and roller 31 in its forward position," roll 28 can be easily dropped into position and whileholding the end of web 42 in one hand, the operator can return roller 3| to its normal position, at rest on pins 43. The web 42 can then be directed. by hand to the forward part of the machine without threading it over or under a series of rollers which is the usual custom. The brace 36 serves to render the cover 24 rigid and in addition strikes the roller 3| in its forward position when attempt is made to close cover 24, thus insuring that the machine will. not be closed by the operator before it is fully. loaded and ready for operation. This construction lends itself to speedy loading without fuss or jamming of-the tape in the machine, ,Also roller 3| in its normal position when feeding a piece of tape fromqa full roll 28, will lift the roll atthe start of feeding oifof plate 33 thus re moving the friction caused by the;p1ate. Hence, the feeding elements function normally and feed accurate lengths of tape when a full roll of tape is newly inserted in the machine as the inertia of the roll does not. interfere with feeding action but in fact helps to prevent inertiafeed by settling backon. the plate 33 when feeding ceases. The web 42 travels over the roller 3| and for.- wardly over the guide roller 45 and. between the web guides 45 whichare integral extensions of the roll'guide plates 35, so that when the adjustment is made by moving the plates 35 on the pivot 31 to adjust the position of the roll 28 the web guides 45 are also placed in position properly to guide the tape web 42 just after it passes the guide roller 45 and just before it enters the tape feeding zone. Hence the adjustment of the plates 35 provides not only roll guiding but also positions the web just before it reaches the feeding elements of the machine.

- The tape web 42 in its forward passage through the machine rests now on the tape supporting 'table which has a slot 5| therein through which the" tape feeding elements may act. The web is held in its forward movement through the machine on :the'table 50' by. the'tape weight 53 which is'removably' positioned on the table 50. As shown iniFigure 4, the weight 53 has similar forward portions 54. and a rearportion joined by hinge 56 and 'has handle 51 to facilitate grasping the same for removal and to provide a centeringume'ans and position adjusting, means for theweight as the handle rests against the fixedshaft 12. The weight 53 is ,preferablyrelatively substantial so that its weight will insure that the tape which is being pushed forwardly by the feeding elements will not buckle but-will continue onits forward path in the machine. Provision of the two piece forward portion 54 hinged at 56 permits easy removal of the'en-; tire weight from the machine for cleaning or other purposes. The weight 53 is also formed with a slot in the rear portion 55 to permit .action 'of the feeding elements therethrough. While the plate 33 and the roller 34 ordinarily prevent any overrun of the tape web 42 from the roll 28, in order'to insure accurate measurement, it is desirable to provide a braking means immediately rearward of the tape feeding ele merits which will prevent any further tape being fed by, momentum after the tape feeding ele ments have ceased to feed and to this end we provide the brake 58 on the under tape'web contacting surface of rear portion 55 of-tape weight 53 and resting directly on the tape web. The brake 58 tends frictionally to resist the passage of tapebeneath it by pressing the tape against the table 50- and the weight of the grasping handle 51 aids in this action. Elements 59 on the under sides of hinged; members 54 provide for proper clearance between the weight 53 and the table 50. As they do not contact the tape web 42, they insure that no frictional retardation shall be applied to the web forwardly of the feed means. Tape feeding means.-While any convenient means may be used which are adapted intermittently to be moved in and out of tape feeding engagement during the operation of the machine preferably while motor 21 is running, we prefer to use a pair of feed rollers which grasp the tape between them, only.v one of the rollers being driv-, en in the form shown. The surfaces of both rollers are;preferably.l;nur1ed or otherwise. formed 50 for. insuring proper. graspingof the tapeduring feeding. v V 5 V The roller 6| is mounted for rotation on the shaft 63 which also carries the large gear 64 andisdriventhereby; The gear 64 inturn is 55 driven by the pinion 65 which is mounted .on-v the shaft 6'I,and.the pinion 85 is driven bythe gear 69, mounted on the shaft of the motor 21. Accordingly, it will be seen that upon the operation of the motor Z'Lthe feed roller 61 will be directly 60 and {continuously driven. Any other suitable gearing may be used for drivin the feed roller. The ,idler 60. is mounted for rotation on the shaft 'lfl which shaft is journaled in thelinks H at either r sidelofthe tape path. The links Hare 5 pivotally mounted on the fixed shaft 12 mounted,

in the side walls I! and I8 of the tape feeding portion of the machine. Links II also mount shaft 14 between them. I On the ends of shaft 14 arejournaled the upper ends of the legs of the v U-shaped yoke 15 (see Figure 3) so that vertical movement of the yoke 15 will result in movement of the idler 6B in a vertical direction towardand away from the driven roller 6|, thus moving the feed elements in and out of tape feeding relation. The baseofthe yokeglE is securedto the arma;

accesses ture I6 .of a solenoid 11 which is mounted 'on a bracket I8 secured to the side wall of the machine. 'The solenoid "I1 is adapted whenenergized to exert a downward pull on the armature 16 whereby the yoke I5 will also be pulled'do wnward and the idler :60 will thus :be brought into tape feeding relation with the constantly revolving driven roller 5| whereby tape will be fed.

In order to insure that when the solenoid .71 is not energized the feed rollers will definitely be separated and not feeding tape, springs 80 secured to the base of the yoke I15 and to the hooks 8I which aremounted on the bottom 'of the'table 50 are t'ensioned to hold'the yoke its extreme upward position limited by the upward limit of movement of the armature 16. It is clear from this construction that the tape feeding rollers "will only be "in tape feeding relation when the solenoid TI is energized but in order to insure the proper relation of the tape feeding rollers at all times and also to obviate the necessity of providing a solenoid havin a substantial length of stroke, we prefer to provide an adjustable conmotion between the armature and the yoke 15. This connection may take any convenient 'form. The connection as shown in Figures 1 and 3 includes the split sleeve 82 through which yoke '15 extends. The Sleeve is secured to the armature T6 of solenoid TI below the yoke 15 b pm 83 which normally is spaced below yoke 15. Sleeve 82 has threaded into it screw 84 which bears against spring 85 within the sleeve and the spring in turn bears against the yoke I5. 'Lock nut 86 holds screw 84 permanently in adjusted position. Turning of the screw will adjust the position of the yoke with respect to the in 83 and thus the solenoid I'I.

Tape severing means.-The tape severing means are mounted forwardly of the feeding means of the machine and may be of any suitable construction. As shown they include the links '90 pivotally mounted on the shaft 9'I which is mounted in the side walls 11 and I8. The links have mounted between them at their ends remote from the pivotal mounting, the blade shaft 93v on which is mounted eccentric to the axis of shaft 93 the blade '94. Links 90 also pivot'ally carry the upper end of yoke 95 which is secured to the armature QIo'f the solenoidS'B. The knife 94 may take 'any'convenient shape and as shown in Figure 7 has guide members 95 which extend at all times through slot .92 in table illthus insuring that the knife will be positioned "for operation at "all times. The sliding action in sot 92 insures good shearing action because of the eccentric mounting about the axis of shaft 93. Intermediate the guides 95 the knife is "shown as of inverted V-shape. The portion of the knife is normally held out of the path of the tape by the springs '99 tensioned between the yoke 96 and the hooks I mounted on the bottom of table 50. When the solenoid 98 is energized, the downward pull thereof against the tension of the springs 99 will bring the knife '84 across the path of the tape, severing the same. Theme'a'ns for energizing the solenoid will be describedbelow.

M oi'steni'ng means-Any suitable "type of moistening means may be utilized. As shown, the tape, afterpassing the cutting means, "encounters the plate I over which it passes. The tape passes under the pressurep'lat'e I06 pivoted at ID! to links I08 which are in turn pivoted at H0 to the walls I! and I8. The pressure plate carries an'adju'stab'le weight I69 adapted to'holdthe tape in intimate contact with the moisten-ing brushes II I 'whichare upended in tank 112 and draw moisture therefrom by capillary attraction. The mountingof theplate I06 onthe links 1118 insures easy removal thereof for purposes of replacement or cleaning. As it is contemplated that the tape will be fed through the machine at relatively high rates of "speech-it is desirable in order to secure uniform moistening to provide means for keeping the liquid level in the tank I I2 substam tially constant and to this end we provide a liquid container or fountain I-I-4 mounted in the cradle '5 on the outside of "cover 21. The fountain may be mounted in substantially the position shown in dotted lines .in Figure 1 and has outlet I I6 leading into pa'ssage I IFI whichconnects with the tank H2. Access to the tank ifor cleaning and inspection may .be had through the s-fron't opening of the machine 119-.

Connection of :jeed and control units-It is seen that the tape feeding portion of the machine in the .form of the machine under discussion contains three different instrumentalities which require electrical actuation. These are the motor which drives the tape feeding elements, the tape feeding solenoid and the cutter solenoid. In order to provide that the tape controlling :portion of the machine maybe separated from the tape serving portion of the machine, it is preferred to assemble the electrical leads from the motor "and the two solenoids, into a single cable diagrammatically indicated at 'IZI in Figure 3 which terminates in a plug I22 which in turn is adapted to contact the complementary plug 123 which is mounted in the side of the control unit. It will be seen that it will only be necessary to connect this plug in order to place the control and the tape serving parts of the machine inproper=electrical connection for operation.

Control circuit.-As has previously been pointed out, the length of a piece of tape delivered from the machine is dependent upon the length of time that the feed solenoid T1 is energized to hold the feed rollers 50 and BI in feeding relation since the motor 21 is of "constant speed type.

A preferred hookup of electrical instrumentalities to control the operation of the feeder and cutter solenoids is diagrammatically shown in Figure 8. Power is supplied from any convenient power source I30, it being assumed that, as is customary, the power source will be alternating current. Suitable and obvious changes could be made in the circuits 'to adapt them to a "direct current power source. Connection I3'I may be made to the power source and may take the form of a plug or the like in the customary man ner. Switch I32 which may conveniently be mounted on the outside of control unit "(see Figures 2 and'3) is adapted to provide for the energizing of all of the circuits used. so that with the opening of this switch, the entire apparatus is cut off from electrical energy. A suitable pilot light I33 (see Figures -2 and 3) is connected to the "power source between leads I34 and I35 so that closing of the switch will result in the pilot light being lighted informing the operator that the machine is ready for operation.

The closing of switch 132 will also close an alternating current circuit through the motor through lead I36, plug 25, th motor, plug 25, and lead I 31. Hence the closing of the switch I32 will start the operation of the motor. As the closing of the switch does not cause the feeding of tape, the motor will have time to come to constant speed before a strip is fed.

A .power'pack I40 or other suitable connection is provided for conversion of the alternating current to direct current. The measurim, is..accomplished throughza constant voltage circuit which includes a condenser. Mlanda tube.I42, constant voltage output being obtained from the power pack. The tube I42. is adapted to break down when the condenser reaches a given-voltage and current flows sufiiciently from thestarter anode of the tube. toathe cathode to initiatev the flow of current in =themain gap of the tube which flow of current is adapted to stop the feeding.

of tape by operation'of a relay whichbreaks the circuit containingthe feed solenoid. .We have founda cold cathode tube useful in this connec: tion but other tubes having equivalent characte'ristics or other devices capable of similar function may suitably be used. Thestart of the building up of the condenser MI and the feeding of tape is. accomplished bythe depression ofa key in the unit bank 146 which closes a'circuit which operates start relay I43. Operation of the start relaycloses circuits which operate the feeder solenoidand start the timinginterval'. When the condenser MI reaches a predetermined voltage,

the tube I42 permits current to flow in the main gap to. operate a stop relay I457 The operation of the relay I45 opensthe circuit containing the feeder solenoid TI and closes a circuit containing the cutter solenoid 98' as .well'as restoring the depressed key to its normal position readying the machine. for delivery of another strip of tape.

Inasmuch as direct currentof constant voltage is 'only required in the resistance timing, circuit since the relays I43 and I45 may be energized by a non-constant D. C. voltage, only a small portion of the output of the power pack need be utilized .forth'e constant voltage D. C. supply; thus 'thecost of the power .pack may be minimized. The operation of the hookup; including all of the circuits involved, can best be described by illustrating an example of Such operation. a Start relay.--Thus if key (9 for instance) in the unit bank I46 is depressed, a circuit will be completed through the lead I41 fromthe nonregulated'direct current supply, lead I48, the key contact I49, the lead I50, the start relay I43, the lead I5I and the lead I52 returningto the negative power supply, -The energizing of this circuit, by operating the start relay, has broken contact I54 and has made contacts I55, I56'and I51; Thus four other circuits are affected by operation of the start relay and these will now'be described. The contact I54 being broken, the short circuit which heretofore existed around the condenser m andihcluded lead I65, resistance 111,: lead v I61,c0ntact I54; lead I65, 1ead I18 and lead I52 is broken. Thisshort circuit servedthepurpose of keeping the condenser absolutely discharged prior to the'cornmencement of the timing interval.

The making of the contact I55 initiates the flow of regulated direct current to the condenser I4I, thecircuit including the lead I68 from the.

power pack,.contact I55, lead I59 and the various leads in the tensbank of keys I38 which intheir non-depressedcondition, (which is the assumption of this example) include no inserted resistances, the lead I16, the lead '3', the key contact I12 whichwaspreviously made by the depression of key No. 9 of unit bankI'GG, the series of resistances I15, the variable resistance I16. the lead I65, to the plate of condenser I4I, also the resistance I11 to the-starter anode #92 of the tube I42 andthe leads I18 and I52 back to the negative power supply. It will be seen that when this circuit-is set up the timing intervalhas begun by applying current ofregulatedvoltageto the condenser I4I which thereupon begins tozbuild up to the. break down voltage. of the tube 142. When this voltage is -reached,.curren t will flow in the starter gap of the tube,i.. e., from starter anode I92 to .cathode I93, initiating flow of cur-, rentin the main gap, i. :e., between anode I9I and cathode I93.. The BfiBClLOf thisaction is de stop relay whichcauses the deenergization of the feed solenoid for proportional periodsiof time which the feed rollers Bo and 'BI will be infeeding contact, feeding O'to ,9 inches. In this instance the'9 inch-key has been depressed,.and'nine-1 inch resistances-I15 are in the timing circuit, hence while the condenser is building 111 .9 inches of tape will be deliveredpii A As can beobserved; however, from Figure: l-"o'f the drawings;.1the tapeweb in the form of machine shown travels for a considerable distance in the machine after it passes the feed-elements 581 and GI and it will be undesirable to feed in the-rheachine, lengths of tape shorter than will; :when. fed, present; the end thereof at: the front'portion of the machine .for graspingand; removaL-j This statement is-not' intended to limit" the construe tion of the-machine ltogth'e specifi'c' for'mqshown, but it is clear"that,'for example in-Fi'gure 1,-if-e1 piece of tape'of one inch'in length were fed, the: forward end'thereof would not issue from the machine. This'would cause confusioniand. jam+ ming of the machine when the nextstripwasfed; Furthermore, as machines of th'etype under con-" r sideration are adapted mainly for use in. shipping rooms which do-not'require such short lengths of tape, it will ordinarily not be necessary to feed such short lengths. 91 1 I For this reason the description of thexcirc'uit which is closed on the closing of contact 'l55set forth above applies 'only "to delivery of lengths of tap'eicaus'ed by thefdepression of the'4-inch"key or aboveof th'eunit' bank [45. fit -for example the'Z'inch key of the unit bank I46 is depressed; the timing circuit vvil'l then include 'thelead 168i the contact I55, lead l'fiil the various 'leads'of the tens bank I38 as set forth above, lead I10, :re'si'st+ ance ISO-which may conveniently be made equiv-j alent to a time for delivery of for example ten inches of tape, key contact- I8 I',"two resistances I 15 below the'key' contact' I8I corresponding't'o two inchescf-tape, variable" resistance I16 "etci' as above. The resistanceIM has the 'eifect'of adding enough length'to the strip delivere'd'so that it will'not become jammed in the machine if by mistake-a key in theju'nit'ba nk I46 below 4 inches should bede'pressed. J

It is clear, however, that it may be desirable at times to feed a' length of tape equivalent'ito one of;these-l'ower' units of inches plus a multiple of ten inches-as for example twenty-two inches andthe circuit which will produce the delivery of twenty-two'inches will now be described. This circuit will also obtainwhenever any key in the bank I38-is depr.essed, i. er, wheneverlteninches or more? of tape is. desired... The 20 monkey. in; the tens bank- I38 isfirst depressed but. does-not close any circuit or? cause any tape to: be: delivered: until a key the unit: bank Mt is depressed (obviously if. twenty inches alone: is desired-,the; 20: inches key in the" bank I 38? will first be: depressed and the key'in the bank I145 willzstarti the timing interval as above: described). The inch key in the bank I38. having been. depressed, contact: between leads I83 and I84 broken, contact? between leads i8 3ranu I85 is made and" contact I88 is made; The two inch key in; the: bank: I146 is'now'depre'ssed and completes a includiiigflead- I68; contact' I lead. I 69,. lead; I 83;. lead I85; resistances. r86: equivalent to twenty inches of tape, lead IiIil; leaidii I. 81;.keycontact I 8.8; lead F89; the lasi; three menti'oned conductors being at short "circuit-around. resistance: I:8 ll key contact: I'8 I which: has made: on the; depression offthe'2 inch'keya resistances I515. belovw'the 2: inch key, variable: resistance:- I'IE, etc. as: originally described above: It' is. seen that the. depression of one oii thetens keys notionlyinserts the appropriate: resistances into: the timing-f circuit to pro-= duce a; length of' tape: equal: to: a multiple of ten, but; also shortcircuits the resistance I365) which: is no longer necessaryto prevent the delivery'of a piece of tape too short: to issue from the: mar-- chine; whereby" apiece of: tape:- equal to a multiple of ten". inches" plus less than. four inches in". the example shm is delivered;

With the exceptions apparent from the dc scriptionsgthecircuits obtained on depression of aunit key above or below 4, or belowe includinga'imu'ltiplei oflwirom th-ebank:I=38;.a;rasimi1ar ex ceptthat more; or less resistances are: inserted in the circuit and it is accordingly: not deemed 1113C essary'to descrihe the obtaining of; lengths of tape: from. 5 to fiil i'nchestwhinh can. be obtained: in the": construction of the example shown; suitable? re sistan'cesmayof courserbe employed to: providedor; delivery of. lengths greater than: 59 inches. Itisalso. clear-"thatzany desirable unit-of measurement may be: employed such as centimeters: or multiplesiof inches or centimeters; It is-- understood that: when. a key is depressed, it stays depresseduntil released: by some means and. this construction will be more fully pointed below'.

Returning: nowto :the: circuits which have been completed. by the operation: of? the start relay I'4:3-, it" is seen". that the. contact; I5.6- closes on. the op-- eration of: the: start relay. contact. prepares. but does not close a circuit; which. includes the; leads IMF and I48, contact I510 stop: relay I.45.-,. lead l:90 ,.to'the.-' anode I9I' of'theitubedu; When the: condenser I74-I: ischarged to the breakdown" point. off the:- tube,-. the starter anode I92 of the time. I42 will pass current tothe cathode: I93: in the starter" gap" of the tube and: by exerting a trigger or starting actiom causethe tube to ionize andpermit current to passin-the. main gap of the tube from the: anode I.-9'-I.- to the cathode I193, to the: leads I18 and I52, thus completing a circuit which operates the stop-relay. However, this circult is-not completed:untilithe-tube ionizes'so that the contact. I59, which: is closedby the start relay I43, merely prepares the way for: operation oi the? stoprelay.

The contact I51 closesan. alternating current circuit which operates the: f eedsolenoid and includes the leads I95. contact I51, lead I 96; feed solenoid T1, lead I91 contact 200- of the stop relay which is normally closed" when. the: stoprelay is. not energized, and lead I52- to thernegative. power. supply. This circuit energizesther- Edd. solenoid 12 sothat'th'eieed rollers arernow' in operation and are feedingrtape;

Stop relay;--As: mentioned. in. connection. with thezd'escriptionof the circuit including thecon-tact. I156] which was closed bythe: operation of the start; relay; a. path; has been prepared for the: completion of. a. circuit. which. includes thestop' relay I45, anode I9;I and cathode: I.93'of. the. tube: I42; Accordingly when the. breakdown; point of 5 tube. I42 is reached and. the; flow of current: from anode I92 to. cathode: I93 initiates. the fiOW; of. current: from anode. I9 I'. to cathode: I93 thusconr. pleting'. the circuit; the: stop relay will: operate; The: circuits completed; or; broken by stop. relay'willnow'bedescrihed.

The circuit including? contact 2H0: isinormally passing: current: when the. stop. relay is: not; wer gized'. It" has been; fully-described in connection with. contact I51; which. the operation. of. the: start relay" I43. closed. This. circuit is. broken. on the: operation of the: stop. relay I45 and. since; this circuit includes thefeoder solenoid. I1, energi'za tion. of the feeder solenoidi ceases; the: tape feed-- ing: elements. separate, and the feeding. of: tape immediately stops;

On the. operation otfstop relay- I4-5, .conta-ct 20.I makes, completing am alternating: current. circuit. which; includes: lead: Iti,. lead 205, key release. solenoid. 206, lead. 201, contact20'l. and lead I52. to negative: power. supply; The energization. of. key release solenoid: 205. releases the. previously depressed keys to: their original; condition; thus. preparing the apparatus for: the delivery of the next strip of tape. The: manner in' whichthi's solenoid releases the keys will: be. more fully pointed out below Operation of stop relay I45 closes contact; 202 which completes an alternating, current circuit including leads L95 and 208-, the. cutter solenoid 98;.Iead1209; contact. 202 and. lead. I52 tonegat-ivepower source. This" circuit; is seen to include the: cutter. solenoid:v 98- andaccordingly operates the cutter-to sever the already delivered: piece of tape.

When the stop relay I45 operates, the contact. 200' in the: circuit including the feeder solenoid I.'I-,, immediately breaks and the solenoid TI: releases the feed. elements so that the feed of. tape immediately stops; Thev making; of .contact 202' results. in the energizing of. the cutter solenoid 98' but: it will be seen that. this does not take: place until; after: breaking ofthe contact: 200 so that the: tape will. have the: short time necessary to come. to a complete. stop before cutting occurs. While we have found that: this short-time interval; is sumcient to allow the tape to come to a stop before cutting if it should; be found that cutting; takes place while tape still retains. some residual motion, the circuitwhich includes the cutter solenoid maybe utilized to operate a further relay which relay may operate to close a, circuitincluding the cutter solenoid thus lengthening the time interval between. the stop of the-feeding; and the cutting.. Naturally since very short periods of time are involved, insertion of this additional relay will result in. absolute. certainty that no. cutting can. occur while.- the tape. is. moving'.

The operation. of the key release solenoid. 20B

restoring: the depressed. keys to normal. has.

broken the circuitmade' by depression of the. 9 inch key from the: unit bank I46. which circuit included the start relay, and the. start relay being. nolonger energized,v the contacts I54, I55; I55 and I-5:'I are restored to th condition in which they were prior to the energization. oi then start.

13 relay I43, that is contact "I54 has made restoring th'e'short circuit around tube I42, contact I55 is broken opening'the timing circuit, contact I56 is broken opening the circuit including thestop relay I45,-and contact IE1 is broken opening the circuit which, contains the feeder solenoid 11 which has already been 'broke'n fiby the breaking of contact 200 on the operation of stop relay I 45;

I The breaking of the circuit including contact I56, which deionizes the tube I42, deenergizes the stop relay I45 so that contacts 200, 20I-and 202 are restoredto their original condition before the operation of the stop relay. Contact 200 in the circuit including the feed solenoid 11 makes, preparatory to the delivery of the next strip of tape but of ,coursenot completing a circuit through the solenoid 11. Contact 20I breaks deenergizing thekey release solenoid 206 whereby the keys may now be operated to deliver another strip of tape. Contact 202 breaks, breaking the circuit which includes the cutter solenoid .98 whereby the cutter solenoid is deenergized and the knife moves upward from the path of the tape in-a manner previously described. The ap-,

paratus is now ready for delivery of another strip of tape. 7

Key construction.-It is, of course, clear that any suitable means may beemployed for inserting resistances in the timing circuitand .it is not intended to limit our invention to the construction shown. However, in Figures 2, 3, 5 and 6 are shown a preferred form of switches actuated by depressible and releasable keys which are adapted on operation to insert-suitable resistances into the timing circuit and suitably affect the remaining circuits in the manner described above. We have found it preferable to dispose the keys in convenient position extending above the cover 2I0 of the control unit, arranged in a units bank I46 and a tens bank I38. 1 Mounted on the underside of the cover 2I0 of the control unit is a switch supporting-frame 232 which includes upper and lower slotted channel members 220 and 233. The keyswitches 222 are provided with upper shaft portions 224 and lower body portions 221. The shafts 224 extend through the slotted channel members 220 and the cover 2I0 and are topped by push buttons 226. The shafts 224 carry shock insulating pads 22I of rubber or the like which absorb the shock of the upward movement of thekey against the member 220. The body portions 221' which are considerably wider thanthe shaft 224 as may be seen from Figure 3, are provided with upper slots 228 and lower slots 229 through which-the lock bar 252 extends in a manner to be described. The body portions 221 terminate at their lower ends in three legs 248, 249, and 250. The outside legs 2-48 and 250 are adapted to pass on either side of the base member 233 when the key is depressed. The middle leg 249 is provided with spring 25I which tends to thrust the key in an upward direction except when it is held depressed by other means.

Referring to Figure 5, the lock bar 252 is provided on its upper surface with extensions 253 having catches 254 and angular top surfaces 255. On depression of a key the edge of slot 229, acting against the inclined surface 255, will force the bar 252 in the direction of the solenoid 206 until the end of the surface 255 is reached. Then the key which is being depressed is further pressed down until the slot 228 engageswith the catch member 254 and the spring 262 thenforces 14 the bar in a 'direction'away from the'solenoid thus engaging the key. a

The bar 252 is operatively connected at its end remote from the solenoid to the connecting bar 210 which joins it to' the lock bar 21I of the tens bank of i keys I38. The mechanical constructi'onandaction of these keys is identical with those of the units bank. The bar 210 is also connected with the pull bar 212 which is secured tothearmature 260 of the solenoid 206 and may be regarded as an extension thereof. Energization of solenoid 206 will result in clearing of both of the banks of keys of any depressed keys. :Spring 262 tends to hold thelock bar in its forward position so thaton depression of a. key, the same will be positively held'in its depressed position until released by the release is energized whereby the armature 260 exerts a pull'to the left in Figure 5 thus releasing the catch member 254 and permitting the key to return to its normal position as has been described,ready for the delivery of another'piece of tape.

In order that a release may be had ofany keys depressed durin the time the machine isnot inoperation, it is preferable to provide a manual key'release button which may be .utilized to clear the two banks of keys when operation of the machine is about to start. To this end is provided the ear 215 which is mounted on the underside of the frame 2I0 and which has pivoted thereto at 280 the plate 216. Also pivoted to the plate 216 is' the release key 211 which may suitablyextend through the frame 2I0 between the two banks of keys as shown in Figure 6. The release key' is normally held in its upward position by spring 218. The plate 216 which may be of rectangular shape, as shown, lies in slot 21 9 ofbar Y212 and a downward thrust on the key 211 will result-in moving the plate 216 in a clockwise direction about the pivot 280 thus thrusting the bar 212 in a direction to releasethe keys whereby spring 214 will return bar 212 to its normal position just as effectively as if the solenoid 206 had been energized. Operation of this mechanism prior to operation of the machine will insure that no undesired resistances are in the timing circuits and will further insure that when switch. I32 is turned on, the motor21 will be given an adequate time to warm up and reach constant speed before the machine, is operated for delivery of tape. The detailed construction of depressible and releasable keys is substantially that shown in United States Patent No.

Switch contacts-Any convenient means may be utilized to insure that the operation of the button switches 222 will complete orflbreak the proper circuits as describedabove in connection with the wiring diagram Figure 8. The construction illustrated in Figure 3 which is also that shown in the above mentioned patent includes insulating material 30I mounted on the side of body portion 221 of the key switch 222 and terminal panel 302 of insulating material mounted on the frame-232. vReferring to the wiring diagram Figures, it is seen that the depressionof a key in the units bank effects the making of two contacts while that of the tens bank effects the making of two contacts and the breaking of one, Consequently we haveprovided double Ll-shaped malecontacts 310. and: 315 on the insulating ma,- terial 39! of the keys in the bank I46 and double female contacts 304 and 995- on the terminal panel 382. Similarly in the bank 138-, double male contacts 399 and 39-? are provided on the insulating. material 381 and double female contacts 321i and 322 as well as, single contact 323 are: provided. It will be seen that these contacts are; adapted on. operation of one of the push button switches to modify the circuits as shown in Figure 8..

In Figure 9 is. diagrammaticallyshown an alternate form of construction of tape delivering and severing means, which has the advantage of including only one solenoid for operation of these means, This, construction includes the tape table 285 over which the; tape web 286v passes. Feed elements include driven roller 288 and idler roller'289. The last mentioned roller is; mounted on a. pair of: arms 2'9l pivoted at 292 in. the-side walls of the: machine and having mounted on its end, remote from, the roller 28.9, the cutter 294 pivoted at 2.95.. Solenoid 291 has armature 29B operatively connected to the arms 2'9lbetween the pivot 292 and the idler roller 28 9. Arms 29! also. have extension spring 36!! attached to the arms between the pivot 292 and the pivot 29%. It will be. seenthatenergization of the-solenoid 29! resulting: in a downward pull of the armature 298' will pull the feed roller 289, downward into positive tape feeding engagement with the driven roller 288- and at the same time will move the knife: 294 out of the path of the tape. When the solenoid 291 is deenergizedi the spring 300 will move: the arm 29! in a. clockwise direction about the pivoted mounting 292 bringing the knife 294 sharply down to sever the tape, while of course separating the feed rollers 288 and 289. In this construction it is preferable to provide the knife 294- with a small amount of. travel before it actu ally contacts the tape. As the feed rollers will separate immediately the spring 300 is thus permitted to act and While the knife 294 travels this short. distance, the tape web 286'wil1' come to a dead stop.

While we have described in detail certain preferred procedures to be followed in practicing our invention which we have found to be convenient and practicable, and while we have illustrated and described in detail certain forms of apparatus which we have found Well adapted to carry out the required operation, we do not wish to be understood as limiting ourselves to the performance of the process in the precise manner set forth or the following of a particular sequence of operations where not essential to secure the intended result, or to the use of the particular apparatus as set forth in the specification, as we realize that changes both in procedure and in the apparatus are possible and we further intend each step or sequence of steps and each element or instrumentality appearing in any of the following claims to be understood to refer to all equivalent steps, sequences of steps, element or instrumentalities for accomplishing substantially the same result in substantially the same or equivalent'manner.

We claim:

1-. Anapparatus for feeding measured strips oftape, a pair of feed rolls to feed the tape, a constant speed motor for driving at least one of said rolls in tape feeding direction, said rolls being mounted for relative movement into and out of tape feeding relation, and electrical means for controlling the delivery of strips of tape ofpredetermined length, said means including a feeder circuit, a timing circuit and astop circuit, s-ai'd feeder circuit having instrumentalities for bringinglsaid tape feeding elements into tape feeding relation when said circuit is. energized, said timing circuit being coordinately energized with said feeder circuit, saidtiming circuit completing. said stop circuit after a given predetermined interval of 'time comparable to a given predetermined length of tape: and said stop circuit having: means to break said feeder, circuit whereby said feed rollsare: removed from tape feeding relation and feed; of tapeceases...

2- An apparatus for delivering strips; of. tape of predetermined length, including; feed; elements for feeding: the tape, a: motor mounted; to drive at: least: one of said feed elements in; tape feeding direction, at least; one of: said tapefeeding elements: being mounted for movement into and out of tapev feeding: relation, a cutter for severing: the. tape and electrical means for-controlling the delivery of predetermined lengths of: tape and the severing of: the tape after' delivery of tape has ceased; said means. including-a feeder circuit and a. cutter circuit, said feeder circuit includingin,- strumentalities moving said feed elements into tape feeding relation when said circuit is energized whereby energization of. said circuit starts the feed of tape, said. cutter circuit. having instrumentalitie operating: said cutter: when said circuit is energized, a timing: circuit adapted to be energized when said. feeder circuit is energized whereby the feed of tapeand the'timing'interval will start simultaneously, said timing circuit after a predetermined period; being, adapted to start the flow of current in a. stop circuit,.said stopcircuit being adapted tobreak said feedercircuit' and thereafter to close: said: cutter circuit whereby feeding ceases and the tape is severed by the.- cutter.

3. An. apparatus for feeding,- measuring and severing strips of tape including a pair of feed elements'between which said tape passes, a motor adapted to be driven at constant speed, one of said tape feeding elements being driven. in tape feeding direction by said motor, at least one of said elements being mounted for movement into and'out of tape feeding relation, a cutter for severing the tape and electrical means for moving said elements into tape feeding relation, holding said elements in tap feeding relation for a predetermined length of time to feed a predetermined length of tape, releasing said elements whereby the feed of tape ceases, and operating said cutter to sever said tape, said means including a feeder circuit having therein means to translate electrical energy into force, and a cutter circuit, said means in said feeder circuit being mounted to move said tape elements into tape feeding relation when saidcircuit is energized whereby'energizing said circuit startsv the feed of tape, a timing circuit, said feeder circuit and said timing circuit being adapted. to] be energized simultaneously whereby the feed: of tape, and the. timing interval will start, together, said. timing circuit, after a predetermined period being adapted to initiate the flow of current through. a stop relay, said stop. relay having a contact, in said feeder circuit and breaking the same when energized whereby feed of tape ceases, and closing said cutter circuit, said circuit containing means to translate electrical energy into force, said means being adapted to operate said cutter when said circuit is energized whereby the cutter is operated;

4; An apparatus fori feedingand severing measured strips of tape including a pair 'offeed elements to feed .the tapa a motor mounted to handle 'for' convenient grasping and additional drive at least one of said elements in tape feeding I direction; at jl'east'oneof said elements being movable in and out of tape feeding' relation a cutter to sever the tape and electrical control means tostart the feed of tape, measure the length of tape fed, sever the'tape and cut'the said timing circuit, said stop circuit being' energized at the end of saidtime'interv'al and said stop I circuit energizing a relay which breaks said feeder circuit and energizes said cutter circuit whereby the feed of tape stops and the tape is severed;

5. In an apparatus of the class described, a

pair of feed elements, one of said elements being,

mounted for movement in and out of tape feeding relation, said movable element bein mounted on a pair of pivoted arms, a yokefthe legs of which are secured to said arms between said pivot and 'saidfeed element, and a spring secured to said arms'on the other side of said pivot normally holding said feed elements ,in non-tape feeding relation andelectrically operated meansto exert forceuponsaid yoke't bring said feed rollers into tape feeding relation against the pull of said pri g.

, 6., An apparatus as claimed in claim 5 in which a tape severing knife is mounted on the end of said arms remote from said feed'ele'ments, said knife being adaptedto move acrossthe path of the tape when said rollers are moved out of tape feeding relation. Q l

'7. Ina machine .for delivering. strips of tape,

I a roll of-tape to'be fed, guide members for centering said roll in the machineincluding a shaft forwardly of said roll, ,plate members pivotally mounted on said shaft for movement along the axis of said shaft, selective. slots nearlthelbase of said roll to engage said plates and held the same in adjusted positions against the sides of the roll, said roll having a web extending therefrom through the-machine and integral extensions on said plates extending on either side of said web as it travels through the machine.'..

1 8. A- machine for delivering strips of tape having :a-roll of tape to be fed, a shaft in said machine forwardly of said; roll, said shaft carrying roll guides slidably mounted thereon. slots in the Weight mounted on the rear thereof. i

11. In apparatus 'for feeding strips of tape hav ing a tape web, a; tableover which the web'travels V and feeding means mounted to act through said table, a brake acting on said web rearwardly'of saiditape feeding means, said brake comprising a weight pressing said web upon said table having -a projection on: the underside of saidweight engaging saimwebdirectly before it reaches said feeding means and having an additional weightprovidinghandle mounted directly over said projection.

12. An apparatus for feeding measured strips of tape including an intermittently operable feed 'd'evice to feed the tape, means'to actuate said device to feed'tape, an electrical timing circuit energizablecoordinately with said actuating means," and instrumentalitie "actuated by said bottom of the machine beneath said roll, and keys on said guides engaged bysaid slots wherebyv said roll is centered, a tape throat in said machine, through which tape from said roll is fed, and integral extensions on "said guides extending'on either side of said web just prior to its entrance into said tape throat,

9; In'app'aratus for feeding strips of tape, having a tapeweb and a tape'path in which said web travels, a pair of feed elements acting upon said web on the top and bottom thereof whil said web is in said path, a weight for holding said tape in said tape path having a rear member, a pair of forward members and hinges joining said rear and forward members, said feed elements acting between said forward members.

10. A weight as claimed in claim 9 having a timing circuit after a, timed interval to stop the feed'of tape. .l;

- 13. An apparatus as claimed in claim 12 including means to .vary'fthe-ti'med interval.

14; Apparatus a 'claimed'in claim 12' in which the instrumentalitiesactuated by-said timing circuit include a,- stop circuit to render-saidfeed means inoperative, and means in: said timing circult to energize saidjstop'circuit. at the end ofoa timedaintervals I '15. Apparatus'asiclaimed in claim :12 in which said timing circuit includes a condenser and a switch-operabl to stop the feed of tape only when said "condenser" has received agiven predetermined charge. i

16. Apparatus'as claimed in'jc'laiml2 in which said timing circuit includes acondenser andsaid feed stopinstrumentalities include 'a switch; operable to stop'the feed of tape when a predeter- -mined charge has beenimpressed on-said condenser, and means to'.. vary :thejtinie required. to bring said condenser to said-charge, said means including-a'series of. resistances selectively insertable into said timing circuit.

17.; Apparatus as claimed in claim 12 inwhich said timing. circuit'i'ncludes the starter gap of a tube and said tape feed stopping instrumentalie ties includea circuit having the main gap ofsaid tube, ionization'of said'tub occurringat a given predetermined charge across; said starter gap, whereby current flows in "said main gap tostop thefeedoftapei 18. Apparatus as claimed-inclaim 12 includingmeans to prevent" thefe'eding of strips'of tape of less man 'give'n' predetermined length; 19. 7 An a' m11'-a1; f ieed'ng"measuredxstrips of tape including anintermi'ttently operable-feed device to feed the' tape; electrical means toia'ctuate said device to feed tape; an" electrical timing circuit? energi'zable coordinately with said :electrical feed actuating means, and instrumentalities actuated y said timing circuit 'aiter' 'a timed interval to stop the feed'oftape.

20. In an apparatus forfeeding measured strips,

means to feedsaid strips and electrical ineansior' actuating "said feedmeans to provide fed strips of predetermined length; "said electrical-means including a feeder circuit, a timing circuit, EL'ESlZOP circuit and an automatic-switch:lb'etweenrsaid timing circuit and said stop circuit, said feeder circuit when energized actuating said feed means to feed strip, said timing circuit having a condenser in series with said switch to insure operation of said switch at a given predetermined charge of said condenser, said stop circuit being energized on operation of said switch and itself 

